Hi Folks/Programmers,
I’ve come across many scenarios ,where a Ruby Rails Developer have to use Inheritance(which is a popular OOPS feature), So today i would like you to share some information about single table inheritance.
With single table inheritance you have a base model which inherits from ActiveRecord::Base, then one or more sub-classes, which inherit from the base model.
Below here is my simple example:-
My Current example is based on Mobile system. We have a single model called ‘Mobile’ and other models such as ‘Samsung’, ‘Apple’, ‘Nokia’ etc., that inherits the property of Mobile model.
so structure come like
Super class
__________
class Mobile < ActiveRecord::Base
end
Base class
________
class Nokia < Mobile
end
while creating table Mobile you just create a type string column on your votes table, and rails takes care of the rest..
When you do Nokia.create(model: "E7"), this record will be saved in the mobiles table with type = “Nokia”. You can then fetch this row again using Mobile.where(model: 'E7').first and it will return a Firm object.
If you don’t have a type column defined in your table, single-table inheritance won’t be triggered. In that case, it’ll work just like normal subclasses with no special magic for differentiating between them or reloading the right type with find.
I’ve come across many scenarios ,where a Ruby Rails Developer have to use Inheritance(which is a popular OOPS feature), So today i would like you to share some information about single table inheritance.
With single table inheritance you have a base model which inherits from ActiveRecord::Base, then one or more sub-classes, which inherit from the base model.
Below here is my simple example:-
My Current example is based on Mobile system. We have a single model called ‘Mobile’ and other models such as ‘Samsung’, ‘Apple’, ‘Nokia’ etc., that inherits the property of Mobile model.
so structure come like
Super class
__________
class Mobile < ActiveRecord::Base
end
Base class
________
class Nokia < Mobile
end
while creating table Mobile you just create a type string column on your votes table, and rails takes care of the rest..
When you do Nokia.create(model: "E7"), this record will be saved in the mobiles table with type = “Nokia”. You can then fetch this row again using Mobile.where(model: 'E7').first and it will return a Firm object.
If you don’t have a type column defined in your table, single-table inheritance won’t be triggered. In that case, it’ll work just like normal subclasses with no special magic for differentiating between them or reloading the right type with find.
